I think your refering to the Mac31cc,has a front facing carb.I had one but tossed it in the trash after taking the carb off.It had roller bearings on the crank and youd have to make a bushing or thrust washer to keep the crank from pulling on the case.May not be hard but not worth the trouble for me i quess.Plus youd have to come up with a mount system if i remember right.To many easier and workable solutions here in the forums.Plus the ones here in the forums are proven winners because a lot of us are using the same engines.